Civil Engineering Reference
In-Depth Information
The column strip and middle strip moments are distributed over an effective slab width as illustrated in
Fig. 4-10. The column strip is defined as having a width equal to one-half the transverse or longitudinal span;
whichever is smaller (ACI 13.2.1). The middle strip is bounded by two column strips.
˜
2
˜
2
˜
2
/2
˜
2
/2
˜
2
/2
˜
2
/4
˜
2
/4
˜
2
/4
(a) Column strip for
˜
2
<
˜
1
˜
2
˜
2
˜
2
/2
˜
2
/2
˜
2
/2
˜
1
/4
˜
1
/4
˜
1
/4
(b) Column strip for
˜
2
>
˜
1
Figure 4-10 Definition of Design Strips
Once the slab and beam (if any) moments are determined, design of the slab and beam sections follows
the simplified design approach presented in Chapter 3. Slab reinforcement must not be less than that given in
Table 3-5, with a maximum spacing of 2h or 18 in. (ACI 13.3).
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